LANCE II SERVICE MANUAL
10-13.
REMOVAL
AND REPALCEMENT.
a. To remove
the regulator valve;
disconnect the
three lines, remove
the mounting
screws and
remove the
valve.
b. Disconnect
electrical wires
from the regulator switch.
c. Replace
regulator in reverse order given for removal.
Check complete vacuum system
for proper operation.
10-14. VACUUM PUMP.
10-15. GENERAL. The vacuum pump
is of the rotary vane, positivedisplacementtype.This
unit consists essentially of
an aluminum housing containing a tempered
sleeve in which an
offset rotor, with moving
blades is incorporated. This assembly
is driven by means of a
coupling
mated to the engine driven gear
assembly. The pump is mounted on the
accessory
section of
the engine.
10-16. TROUBLESHOOTING.
For troubleshooting of the pumps,
refer to Table X-I of
this seciton.
10-17. REMOVAL AND REPLACEMENT. The vacuum pump can be removed by the
following procedure:
a. Remove the top portion of the engine cowling.
b. Loosen the
hose clamp and remove the hose from
the vacuum pump fitting.
c. Remove the
vacuum pump by removal of the
retaining nuts, and washers.
d. Reinstall pump in reverse order
of removal, noting alignment of spline
on the pump
drive with the spline on the engine
drive assembly. Torque standard nuts
50 to 70 in. Ibs.
CAUTION
The only dry air pump mounting gasket authorized and
approved for use on the Airborne dry air pump is the
Airborne gasket B3-1-2, Piper part number 751 859. Use of
any other gasket
may result in oil seepage
or leakage at the
mounting surface.
10-18.
REPLACING
PUMP
FITTINGS.
a. The handling procedure
for securing the pump while installing
or removing fittings
are as follows:
1. Use two soft wood blocks in a vise to protect pump from vise jaws.
2. The pump square mounting flange must be held between the wood blocks at
right angles
to the vise
jaws.
3. Use only enough
vise pressure to hold
pump firmly.
CAUTION
Do not apply vise pressure to outside diameter or overall
length of the pump.
b.
Thread lubricant, if required, should
be applied sparingly to the external
threads of
the
fitting only. Use a powdered moly sulfide
or graphite in dry form or in an evaporating
vehicle; or employ a silicone spray.
Revised: 10/3/80
INSTRUMENTS
2E11
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